Summary of Voltmeter using arduino
This article describes a simple 3-digit digital voltmeter built with an Arduino Uno, capable of measuring voltages between 0 to 5V with approximately 50mV accuracy. The design minimizes external components by using a common anode multiplexed seven-segment display module. The system leverages the Arduino's internal ADC to convert analog voltage inputs into digital values for display.
Parts used in the 0-5V Voltmeter:
- Arduino Uno
- E1-3056ASR1 Common Anode Multiplexed Seven Segment LED Display Module
- Digital Output Pins 1, 2, and 3
- Digital Output Pins 5 to 12
- Analog Input Pin A0
0-5V voltmeter using arduino.
This article is about a simple 3 digit voltmeter using arduino. The circuit can measure anything between 0 to 5V at an accuracy of 50mV. The circuit uses minimum number of external components and can be easily modified for different voltage ranges. The display device is a common anode multiplexed seven segment LED display module (Type No:E1-3056ASR1). Let’s have a look at the display device first.
E1-3056ASR1.
It is a low cost multiplexed 3 digit seven segment LED module of common anode type. Using such a multiplexed module instead of three separate display modules save a lot of wiring and effort. Such multiplexed modules of different configurations are now commonly available in the market. The figure below shows pin out of the E1-3056ASR1 display module used here.
Read this article Voltmeter using 8051 for a better grasp. The idea is same but instead of an 8051 microcontroller Arduino-uno is used here. Circuit diagram of the voltmeter using arduino is shown in the figure below.
Circuit diagram.
Common anode terminals of each display are interfaced to the digital output pins 1, 2, 3 of the arduino respectively. Segments a to dotpoint of the display are interfaced to the digital output pins (5 to 12) of the arduino. The voltage to be measured is applied to the analog input pin A0 of the arduino. Arduino-Uno has six analog input channels named A0, A1, A2, A3, A4 and A5. The voltage in the range of 0 to 5V applied to each of the pin can be converted into a digital value in the range 0 to 1023 using “analogRead” function. That means the sensitivity of each internal ADC channel is 5/1023 which is equal to 4.88mV. The program for digital voltmeter using arduino is shown below.
For more detail:Voltmeter using arduino
- What is the measurement range of this circuit?
The circuit can measure anything between 0 to 5V. - How accurate is the 3 digit voltmeter described?
The circuit operates at an accuracy of 50mV. - Does the project use separate display modules?
No, it uses a single low cost multiplexed 3 digit seven segment LED module to save wiring. - Which specific pins connect the common anode terminals?
The common anode terminals are interfaced to digital output pins 1, 2, and 3. - Can the Arduino read voltages higher than 5V on these pins?
The text states that the voltage in the range of 0 to 5V applied to each pin can be converted into a digital value. - What function converts the voltage into a digital value?
The analogRead function converts the voltage into a digital value in the range 0 to 1023. - Is the sensitivity of the internal ADC channel 4.88mV?
Yes, the sensitivity is calculated as 5 divided by 1023, which equals 4.88mV. - What type of microcontroller is used instead of an 8051?
An Arduino Uno is used here instead of an 8051 microcontroller.
